Plumb's Veterinary Drug Handbook does not list any for fenbendazole (Safeguard or Panacur).Very glad to hear his tendons look okay & he seems to be improving. And I'm glad you were able to spot the lice!
I think it's generally a good idea to deworm chickens periodically if they have access to the out-of-doors. Safeguard goat dewormer (fenbendazole) is a very broad-spectrum, effective & inexpensive dewormer I like to use for cats & chickens.
I don't know if there are any contraindications for combining certain dewormers with Frontline treatment. I would hope not since Frontline is distributed via the oil gland system while dewormers go through the digestive system & possibly the bloodstream.
-Kathy
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